I'm pretty sure I already know the answer to this, but thought I'd throw it out there for comment.
Purely by chance, I came across a beautiful (practically mint condition) Super X Model 1 Trap gun this morning. It's a 30" full, Monte Carlo gun (beautiful wood) with no wear apparent. I took it apart and looked at the gas system. It's clean and without corrosion. Although I'm sure the gun has been fired, it doesn't look it. No box or papers, just the gun.
I can buy it for $550.00. The owner is waiting to hear from me. He won't have to wait long unless you guys tell me to hold off.